swarm_update.rb
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swarm_update.rb
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	#!/opt/puppetlabs/puppet/bin/ruby
	require 'json'
	require 'open3'
	require 'puppet'

	def swarm_update(image, service)
	cmd_string = "docker service update"
	cmd_string << " --image #{image}" unless image.nil?
	cmd_string << " #{service}" unless service.nil?

	stdout, stderr, status = Open3.capture3(cmd_string)
	raise Puppet::Error, ("stderr: '#{stderr}'") if status != 0
	stdout.strip
	end

	params = JSON.parse(STDIN.read)
	image = params['image']
	service = params['service']

	begin
	result = swarm_update(image, service)
	puts result
	exit 0
	rescue Puppet::Error => e
	puts({ status: 'failure', error: e.message })
	exit 1
	end